Final answer:
The minimum temperature at which combustible liquids have a flash point is below 100°F. Therefore, answer B. 100°F is the correct choice for the given question.
Step-by-step explanation:
The minimum temperature in degrees Fahrenheit (°F) at which combustible liquids have a flash point is below 100°F. Flashpoints categories are as follows: Category 4 liquids have flash points below 73°F; Category 3 liquids are those with flash points below 100°F; Category 2 liquids have flash points above 100°F but not exceeding 200°F; Category 1 liquids have flash points above 200°F, and Category 0 liquids will not burn. Combustible liquids are classified based on their flash points in order to ensure safe handling and storage practices, as lower flash points mean the liquid can ignite more easily at lower temperatures.
Regarding the specific multiple-choice question, the correct answer is B. 100°F, because combustible liquids have a flash point below this temperature. It is especially important to not store these combustible liquids at temperatures above their flash point to prevent ignition. This is the reason for warnings on containers to store only at temperatures below a certain level, such as 120°F for some products.